Find the Exact Value cos(270)

$\cos (270)$

Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. Make the expression negative because cosine is negative in the third quadrant.

$- \cos (90)$

The exact value of $\cos (90)$ is $0$ .

$- 0$

Multiply $- 1$ by $0$ .

$0$

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